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Singapore’s air quality worsened, reaching the worst level in almost two weeks, as wind carried smoke haze from forest fires in neighboring Indonesia.

The three-hour gauge pollutant index rose to 162 as of 2 p.m. local time on Sunday, according to data published by the National Environment Agency. That is the highest reading since Oct. 6. An index reading between 101 and 200 is deemed “unhealthy” while a level above 300 is categorized as “hazardous.”

The agency detected 18 hotspots in Sumatra on Saturday and moderate-to-dense haze was still persisting there, according to a statement posted on its website. Some haze from Sumatra was seen spreading to the sea areas south of Singapore and the southern Straits of Malacca, it said.

Indonesia has enlisted help from its neighbors to fight the fires, with Malaysia and Singapore sending aircraft to carry out water bombing in Sumatra, the country’s disaster agency said.